Carbon dioxide gas content detection

This standard specifies the general principles and specific analytical methods for general analysis of beverages. This standard is applicable to the analysis of specific components in beverages. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 601 Preparation of Standard Titration Solutions for Chemical Reagents GB/T 6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682-2008, ISO 36961987, MOD) GB 10789 General Principles for Beverages 3 General 3.1 Terminology and units of measurement used in this standard should comply with relevant national standards. 3.2 The "instruments" in this standard are essential instruments for analysis, and commonly used instruments and equipment in laboratories are not listed item by item. 3.3 The water used in this standard, unless otherwise specified, shall comply with the specifications for Grade III or higher water in GB/T 6682. When no other specifications are specified, the reagents used refer to analytical pure. 3.4 In this standard, "solution" refers to aqueous solution unless otherwise specified. 4. Method for determining soluble solids in beverages (refractometer method) 4.1 Scope of application This method is applicable to transparent liquid, semi viscous, and suspended beverage products. 4.2 Method principle: Measure the refractive index of the sample solution to be tested using a refractometer at 20 ℃, and use Table A.1 to obtain or directly read the soluble solid content from the refractometer. 4.3 Common instruments in the laboratory and the following instruments: 4.3.1 Abbe refractometer or other refractometer: measurement range 0% to 80%, accuracy ± 0.1%. 4.3.2 Organize the crusher. 4.4 Preparation of test solution 4.4.1 Transparent liquid product: Mix the sample thoroughly and directly measure it. 4.4.2 Semi viscous products (fruit pulp, vegetable pulp, etc.): Mix the sample thoroughly, use four layers of gauze to squeeze out the filtrate and discard the first few drops. Collect the filtrate for testing and trial use. 4.4.3 Products containing suspended solids (fruit juice drinks): Place the sample to be tested in a tissue crusher and crush it. Use four layers of gauze to squeeze out the filtrate, discard the first few drops, and collect the filtrate for testing. 4.5 Analysis steps 4.5.1 Before testing, calibrate the refractometer according to the instructions. Take Abbe refractometer as an example, and operate other refractometers according to the instructions

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